<?php
 
function to_nato($words){
    $words = preg_replace('/\s*([^\w\s]+)\s*/', '$1', $words);
    $key = array("A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z");
    $translationKey = array("Alfa", "Bravo", "Charlie", "Delta", "Echo", "Foxtrot", "Golf", "Hotel", "India", "Juliet", "Kilo", "Lima", "Mike", "November", "Oscar", "Papa", "Quebec", "Romeo", "Sierra", "Tango", "Uniform", "Victor", "Whiskey", "Xray", "Yankee", "Zulu");
    $strToRet = "";
    for($i = 0; $i < strlen($words); $i++) {
        $letter = substr($words, $i, 1);
        if(ctype_alpha($letter)) {
            for($keySearch = 0; $keySearch < count($key); $keySearch++) {
                $letterToSearch = array_search($key[$keySearch], $key);
                if(strcasecmp($letter, $key[$letterToSearch]) == 0) {
                    $natoLetter = $translationKey[$letterToSearch];
                    $strToRet .= $natoLetter;
                }
            }
        }
        else {
            $strToRet .= $letter;
        }
    }
    $strToRet = preg_replace('/([a-z])([A-Z])/s','$1 $2', $strToRet);
    //$strToRet = str_replace(" ! ", "!", $strToRet, $count);
    return $strToRet;
}
var_dump(to_nato(' ! awesome. .! '));

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